Telescope



Patented Fune- 24, i924,

JNITF@ S'Ii Meana earner orifice ANDREW WOLLENSAK, OF ROCHESTER, NEVI YORK, ASSIGNOR TO WOLLENSAK OlvTI- CAL COMPANY, OF ROCHESTER, NEVI YORK, A. CORPORATION 0F NEW YORK.

TELESCOPE.

Application filed July 2D, 1922. Serial No. 576,338.

To all whom it may concern:

Be it known that I, ANDREW VVOLLEN- san, of Rochester, in the county of Monroe and State of New York, have invented certain new and useful Improvements in Telescopes; and. I do hereby declare the following to be a full, clear, and exact description of the same. reference being had to' the accompanying drawings, forming part of this specification, and to the reference numerals marked thereon.

My present invention relates to optics and more particularly to telescopes. and it has for its object to provide a simple and efhcient telescope of the size that can be readily carried in a pocket and which can be economically produced to sell at a louT price. rihe improvements are directed in part toward the formation of the tube and toward an arrangement whereby one tube is locked against forcible separation from the other when the inner tube is drawn out to the limit of its focusing movement. To these and other ends the invention consists in certain improvements, and combinations of parts, all as will be hereinafter more fully described, the novel features being pointed out in the claims at the end of the specification.

In the drawings:

Figure 1 is a side view of a telescope constructed in accordance with and illustrating one embodiment of my invention in retracted or collapsed condition;

Figure 2 is a similar view of a telescope extended as in focusing;

Figure 3 is an enlarged central longitudr nal section through Figure 1;

Figure 4 .is a similar section on Figure 2;

Figure 5 is a further enlarged transverse section on the line 5-5 of Figure 4, and

Figure 6 is a detail elevation of the stop thimble for the inner tube. Y

Similar reference numerals throughout the several views indicate the same parts.

The telescope shown in the present embodiment is of the usual genera-l construction in that it embodies an outer tube 1 and an inner tube 2. I construct the outer tube integrally from a tubular body to consist of a central portion 3 of the normal diameter of that body and end portions 4 and The end portion 4 is relatively enlarged by expanding the metal of the tube 3 and the end portion 5 is similarly reduced to a ylesser diameter by contracting the tube, so that the instrument as a Whole has the usual stepped outline although it involves in the present instance only two tubes, this formation being further useful in the manner hereinafter explained.

The object or field lens 6 which is compound in the present instance is held against the end of the expanded portion 4 of the outer tube 1 as a seat by a cap 7 fitting over the tube and provided Wit-h a shoul'- der 8 engaging the margin of the lens on the outside. This cap is preferably cemented in place on the tube. Y The eye-piece S) is similarly held against the end of the inner tube 2 by a cap 10 cemented in place and having a shoulder 11 engaging the margin of the lens on the outside, Which lens is shown herein as a simple lens.

rihe telescope is focused as usual by sliding the inner tube 2 in and out of the outer tube 1. Its bearing is in the reducedvportion 5 only of the outer tube, and its inward movement is limited by the cap piece 10 abutting the end of the outer tube, as shown in Figures 1 and 3. To limit the outward movement of the inner tube I fit into its inner end a split sheet metal thimble 12 the bottom of the cup` portion of which is provided with an opening 13 in the nature of a diagram; The slotted or split portion is indicated at 14 and a lip 15 at the outer end of the thimble is turned over the 'edge of the inner tube in normal spaced relation to the same as shown in Figure 3, so that it bears against the intermediate portion 3 of the outer tube. The thimble may be secured in place as shown by bumping or partially punching the outer tube so that it bites into the thimble, as indicated at 16. The split Walls of the thimble are free to yield inwardly and they do so when the tube 2 is drawn out suiiiciently for the lip 15 to engage the inclined shoulders 17 at the junction of the portions 3 and 5 of the outer tube as indicated in Figure 4, This engagement clamps the lip 15 against the surface of the tube 2 at its end and therefore the tighter the engagement with the shoulder 17 the tighter the reaction of the lip 15 is against the body of the inner tube so that a Wedging action occurs and all of the strain is not pla-ced upon the attachment at 16.

A diaphragm 18 in the interior of the inner tube Q, may be formed and secured in pla-ce in much the same lmanner as the thirnble 12 as Clearly appears.

I claim as my invention l. In a telescope, the combination with an outer tube having a central portion and e, relettivelf,v7 contracted end portion forming an internal shoulder therewith, of an inner tube Slidab'le in the contracted portion of the outer tube as a bearing and provided at its inner end with e spring stop adapted to Y.be compressed against it in y with ln a telescope, the combination With outer tube having a Central portion and a relatively contracted end portion r ing un internal rshoulder therewithi en inner tube slidable in the contracted portion of the outer tube as aY bearing and provided :it ite inner end with a` spring Stop adapted to be Compressed ngninst it in clamping relationship by enge; i with said Shoulder, said spring stop oonsieting of a split tliimble secured Within the inner end of the inner tube and having e lip turned over the end edge ot the tube.

ANDREW YVOLLNSAK. 

